Water-tube boiler.



WATER-TUBE serinin.

Specificaton of Letters Eatent.

Patenteol June 341), ilgilll.

Application fiie January 20, 1912. Serial No. 672,494.

To all whom it may amcam:

Be it known that I, ALFRED FERNANDEZ YAnRow, a subject of the King of `Great Britain.l residing. in Blanefield, and whose post-office address is Campsie Dene, Blanefield, in the county of Stirling, Scotland, engineer, have invented certain new and useful fmprovements in Water-Tube Bollersa of which the following is a specifioation.

T his invention relates to water tube boilers having a steam and Water drum which is connected by downwardly extending tubes With hot water and feed Water drums or eonpartnients, and the object of the invention is to provide means for preventing the relatively cold Water which enters the steam end water drum through the feed heating tubes passing freely or directly to the adjacent generator tuhes and thus Cooling the water in thes/eI tubes and in the water drum or drums with Which they are connected, and also preventing the establishment of an independent cireulation of water between the steam and water drum and the feed water drum or drums or compartments.

The invention fort-her oomprises the rovision of means for insuring that the'ieed heating tubes will be filled with water so long as there is water in the steam and water druin' even should the feed purnp brenli* down. V

With these objects the steam and water drum is provided with one or more longitudinal partitions or baiiies, according to the number of sets of feed heating tubes connected With the steam and water drum, each such partition forning a longitudinal compartment or pocket within the drum opposite the ends of a set of feed heating tubes., and these partitions extend from the lowest of the feed heating tubes approximately to or above the normal water level in the steam drum. The partitions may be solid, or they may have openings which perniit of a moderate flow of feed water otherwise than over the top of the partitions. The supplementary or feed water drums in addition to being connected with the steam and water drum by feed heating tubes, are also connected the-ewith at or about its by means of a pipe or pipes whereby the feed hosting tubes and supplementary or lowest point' feed water drums, which are at a lower level than the steam and water drum are kept full or substantially full of water so long as there is any Water left in the steam drum.

In the accompanying drawings, Figure 1 is a trans'verse section of a water tube boiler embodying Iny invention, and Fig. 2 is a similar view showing a modification of the same.

Referring to Fig. l of the drawings,l have shown I ny invention as applied to a Water 1tube boiler of the Yarrow type (shown in cross Section) having a steam and water drum (z Which is connected with two water' drums 7), b' (one on each side of the furnace) by two sets of generator tubes c, c'. As shown in this drawing two supplementary or feed water drums d, d' are fitted one on each side of the enerator tubes and beyond them in the direction of flow of the furnace gases, these feed water drurns being connected with the steam and water drum a by feed heating tubes e, e' respectively which enter the steam drum at or above or below the normal water level in the said drum.

Wlithin the steam and water drum a are two longitudinal partitions or bati-les, f, one at each side, forming pockets g, g' respectively which are co-extensive longituf dinally with the respective'sets of feed heating tubes and which extend vertically from the lo'west row of feed heating t-ubes either approximately to the normal water level in the steam drum, or beyond this level. These plates or batlies f, f' may, if desired, have openings or perforations which, While erinitting a certain flow of Water from the eed leating tubes into the bod 1 of Water in the steam and water drum a otiierwise than over the upper edges of the baflies, nevertheless prevents any direct or free flowY of Water from the feed heating tubes e, e' into the neighboring rows of the generator tubes c, c' rcspectivcly. Further7 the supplementary water drums (7, (Z' may be connected with the steam and water drum a at or'near its lowest point by means of one or more pipes such as L, 71,' Whereby the drulrns d, fi' and the tubes o, e' may be kept to a greater or less extent full of water, so long as there is any water in the steam drum a, the level of the drnns (Z, (1' being arranged sufliciently below the steam drum a, for this purpose.

A `modified construction of boler of the -same type is shown in Fig, 2. vIn this construction there is shown onlv one supplementary or feed water drum connected by feed heating tubes e with the compartment g within the steam drum'formed by the partition or baffie f. On the other side of the boler there is fitted a set of steam superheating tubes ?f which are connected at one end with the steam and Water drum a at or near its highest point, and' at the other end with a; steam Collector j, the uptake of the furnace gases being divided by a longitudinal partition k and a danper m being fitted on that part of the uptake in which the super-heater z' is disposed in the manner described in my previous British Patent specification No. 10231 of 19102 It Will be understood that in this case also the auxiliary water drum a? may be connected with the steam and. water drum a at or near ts o lowest point by means of an additional pipe or pipes, as and for the purpose descrbed with reference to Fig. 1. i

While the auxiliary or feed water drums may be separate, as shown in Fi 1 and 2, they may lalternatively be consttuted by a longitudinal partition or .partitions n in the main Water drum or drums b, b', as indieated in dotted lines in Fig. 2, such partitions forming a pocket o into-which the lower ends of the outer rows of the tubes c (or c') open and to which the feed water V is delivered, so that the said outer rows constitute feed heating tubes.

Haying thus described the nature of the said nvention and the best means I know of carrying thesame into practical effect, I claim:

1. A water tube boler having a steam and water drum disposed substantially centrally above the furnace, water drums at a lower level connected by generator tubes With said steam and water drum, there being one of said drums at each side of the furnace, a feed water drum or compartment connected by feed heating tubes with the steam and water drum and d'isposed beyond the generator tubes in the direction of the flow of the gases at that side of the furnace, at least some of said tubes opening into the steam and water drum below the normal water level therein, and a longitudinal baflie in the steam and Water drum, said battle forming a pocket closed along the lower side into which the feed water heatin tubes discha'rge and communicating' wit the steam and water drum, said communication 'being sd arranged that the Water entering the steam and Water drum from the feed water he'atingtubes is constrained to mix with the mass of water in the steam and water drum and is prevented from passing directly to the adjacent generator tubes, substantially as described.

- ing tubes connecting the ment on one or both sides of the furnace V connected by feedeheating tubes With the steam and Water drum, at least some of said tubes opening into the steam and water drum below the normal Water level therein, said compartment or compartments communicating With the water space of the steam and water drum, said feed water heating tubes being" disposed' beyond the generator .tubes in the direction of the flow of gases at that side of the furnace, and a pipe or pipes con- 'necting the feed water drum or'drums or compartments with the steam-*and water drum vat or near the lowest oint of the same, substantially as described 3 3. A water tube'boiler having'a .steam and water drum disposed 'substantially centrally above the furnace, two or more water drums connected therewith y generator tubes, there being at least one side. of the furnace, one

ltudinal batfles in the steam and water: drum forming pockets in the same closed along their lower sides but communicatiug with thewaterspace thereof, feed Water heating tubes connecting the feed water heating drums or compartments With said ockets, at least some of said feed Water' eating tubes openin into the steam and water drum below t e normal and pipes connecting the feed water heating drums with the steam and Water drum near itslowest point and outside the aforesaid pockets, substantially as described.

4. A water tube boler having a steamand water drum disposed above the furnace, two or more water drums connected therewith by generator tubes, there being one of said Water drums n each side of the furnace, a feed waterdrum or compartment on one -side of the ful-nace beyond the generator -tubes at that slide and beyond the direction of the fiow of`the furi nace gases, a longitud'nal .baflie in the steam and water drum forming a pocket in the same closed along its bottom and side but communicating therewith feed Water heatfeed water he'ating compartment or drum with said pocket, at

water level therein,

substantially centrally Water drum on each l' or more feed water 'drums or compartments, one or more longleast some of said vfeed water heating tubes communicating with the steam .and water drum below the normal Water level therein,

a pipe connecting the ,feed Water heating drum with the steam and Water drum near its lowest point and outside of the aforesaid pocket, a superheater upon one side of the beyond the generator tubes on 130V boler and 5 the superheater is located for controlling the "flow of asesfrom that side of the furnace,

substatally as descrbed.

En tostimony Whereof have signed my name to ths specficaton n the presence of two subscrbng Wtnesses.

A. F. YARROW. Witesses:

THOMAS SHmms,

NELLIE Kmz. 

